should spin freely but stop when lever is squeezed.
When the bike is new there is a break-in period, wait until
the bike has been used for a couple of hours then try to adjust it again.
If the brake is too tight after you have turned the barrel adjuster clockwise all the way in or too loose after
adjusting barrel counter clockwise all the way out, the cable will need to be adjusted.
Adjust the brake cable by loosening nut on the banjo bolt slightly so you can pull the cable through more and
retighten the nut.